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  <div class="headertitle"><div class="title">cong_ctl_classic.cpp</div></div>
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<a href="cong__ctl__classic_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="cong__ctl__classic_8hpp.html">flow/net_flow/detail/cong_ctl/cong_ctl_classic.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span>{</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#aa4fd5c14f20d7534db287c78387d5f0e">   25</a></span><a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#aa4fd5c14f20d7534db287c78387d5f0e">Congestion_control_classic::Congestion_control_classic</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr, <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">Peer_socket::Const_ptr</a> sock) :</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>  <a class="code hl_class" href="classflow_1_1net__flow_1_1Congestion__control__strategy.html">Congestion_control_strategy</a>(logger_ptr, sock),</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span>  <span class="comment">// Initialize the basics (CWND, SSTHRESH, etc.) in the usual way.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>  m_classic_data(logger_ptr, sock)</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>{</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>  <span class="comment">// Nothing.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>}</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a98ee7d39ccbacacaec6b9e0deff1e6b1">   33</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a98ee7d39ccbacacaec6b9e0deff1e6b1">Congestion_control_classic::congestion_window_bytes</a>() const <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>{</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>  <span class="keywordflow">return</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a03a5671f57a7a8f7b0cdce200d29bd3b">m_classic_data</a>.<a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#adbda0ed3747b1eea62f4d790c37dbe46">congestion_window_bytes</a>();</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>}</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span> </div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a34b8ef88093f082df7a935bbebfae2f3">   38</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a34b8ef88093f082df7a935bbebfae2f3">Congestion_control_classic::on_acks</a>(<span class="keywordtype">size_t</span> bytes, [[maybe_unused]] <span class="keywordtype">size_t</span> packets) <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>{</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>  <span class="comment">/* We have received new (non-duplicate) individual acknowledgments for data we&#39;d sent.  This may</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment">   * affect (grow) CWND.  This is a standard Reno algorithm, so just forward it to m_classic_data</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment">   * which takes care of all non-congestion-event-related CWND changing. */</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a03a5671f57a7a8f7b0cdce200d29bd3b">m_classic_data</a>.<a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#ab3e34468efdf4d9e5b29eceb1fe84665">on_acks</a>(bytes); <span class="comment">// Will log.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>}</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span> </div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#af2340e68dbdbb8d6065ae487b05074be">   46</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#af2340e68dbdbb8d6065ae487b05074be">Congestion_control_classic::on_loss_event</a>(<span class="keywordtype">size_t</span> bytes, [[maybe_unused]] <span class="keywordtype">size_t</span> packets)</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>{</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  <span class="keyword">using </span>std::max;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>  <span class="comment">/* Node has detected at least some lost bytes (at least one dropped packet), or at least so it</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">   * thinks, but it&#39;s not a &quot;major&quot; (Drop Timeout-based) loss.  Follow classic Reno, RFC 5681:</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">   * guess that the available pipe (CWND) is half of what we thought it was; and set SSTHRESH to</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">   * that same value, so that we immediately begin congestion avoidance (slow linear increase in</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">   * CWND), and so that if we later enter slow start for whatever reason, it will end at this CWND</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">   * value (unless something else changes SSTHRESH before then of course).  In addition, we make the</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">   * decay configurable: instead of it being a 1/2 decay, it is settable.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">   *</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment">   * More accurately, set it to max(m_flying_bytes / 2, 2 * max-block-size), where m_flying_bytes is</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment">   * the # of bytes we think are currently in the network (sent but not received by the other side</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment">   * or dropped somewhere).</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment">   *</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment">   * Why m_flying_bytes and not CWND?  It used to be the latter until getting corrected at least</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">   * in RFC 5681 formula (4).  The explanation for the change given in the RFC is cryptic, but</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment">   * basically I surmised it&#39;s based on the intuition that we may not be filling the available</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">   * pipe, yet congestion has been caused, so we shouldn&#39;t just change based on CWND, as that may</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment">   * not even affect how many bytes we allow to be In-flight in the near future (e.g., say pipe is</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment">   * only 10% full).  One of the writers of the RFC explains here:</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment">   *</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment">   *   http://www.postel.org/pipermail/end2end-interest/attachments/20060514/20ead524/attachment.ksh</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">   *</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">   * Note that the DCCP CCID 2 (similar to our protocol) RFC 4341 says &quot;cwnd is halved,&quot; but there</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">   * is no formula, and they&#39;re probably just writing in semi-short-hand; let&#39;s follow RFC 5681.</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment">   * In most cases m_flying_bytes and m_cong_wnd_bytes are equal or nearly equal. */</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>  <span class="keyword">const</span> <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">Peer_socket::Const_ptr</a> sock = <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__strategy.html#a3e9786f9e5f170ca23135a2a815bc3f4">socket</a>();</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span>&amp; snd_flying_bytes = sock-&gt;m_snd_flying_bytes;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>  <span class="comment">/* RFC 5689-3.2.1 and formula (4).  The halving (or other reduction) of the window is computed in</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment">   * congestion_window_decay().</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment">   *</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment">   * Subtlety: FlightSize in the RFC represents the # of bytes in the pipe *before* the loss event.</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment">   * Well, in the RFC it&#39;s just (SND_NXT - SND_UNA), which is not changed by a dupe-ACK-exposed</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment">   * loss.  However intuitively it&#39;s also correct: we want to reduce by N% the number of bytes which</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">   * &quot;caused&quot; the loss, and that # was in effect before we marked those packets Dropped.  Anyway,</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment">   * since we must be called AFTER the Drop, and bytes contains the # dropped, we can compute the</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment">   * pre-Drop total easily. */</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> window_decay_percent = <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a6267f980c8a0f33f8213e1fa4b83ee16">congestion_window_decay</a>();</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> new_wnd_bytes = max((snd_flying_bytes + bytes) * window_decay_percent / 100,</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>                                   2 * sock-&gt;max_block_size());</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;cong_ctl [&quot;</span> &lt;&lt; sock &lt;&lt; <span class="stringliteral">&quot;] update: loss event; &quot;</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>                 <span class="stringliteral">&quot;set sl_st_thresh=cong_wnd to [&quot;</span> &lt;&lt; window_decay_percent &lt;&lt; <span class="stringliteral">&quot;%] of &quot;</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>                 <span class="stringliteral">&quot;In-flight [&quot;</span> &lt;&lt; sock-&gt;bytes_blocks_str(snd_flying_bytes + bytes) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a03a5671f57a7a8f7b0cdce200d29bd3b">m_classic_data</a>.<a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#a79e85a67e583b74cc414524d53650892">on_congestion_event</a>(new_wnd_bytes, new_wnd_bytes); <span class="comment">// Will log but not enough (so log the above).</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span> </div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>  <span class="comment">/* At this point m_classic_data will just start congestion avoidance.  Classic Reno here would do</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">   * a special phase called Fast Recovery, first.  Understanding no such special phase is necessary</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   * in our case requires intuitive understanding of Fast Recovery in context.  Fast Recovery</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   * (following a retransmit) is basically trying to inflate CWND with each duplicate cumulative ACK</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   * to compensate for the fact there is no separate &quot;pipe&quot; (bytes In-flight) variable, and that the</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   * normal measure of &quot;pipe&quot; (SND_NXT - SND_UNA) is inaccurate when packets in the [SND_UNA,</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   * SND_NXT) range are lost, which is the case after a loss event. So to allow more data (including</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   * the retransmitted segment) to enter the pipe, instead of increasing &quot;pipe,&quot; Fast Recovery</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">   * increases CWND.  Once all of the lost packets have been ACKed (after retransmission, as</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   * needed), Fast Recovery ends, and regular congestion avoidance begins; at this point (SND_UNA -</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   * SND_NXT) again accurately represents &quot;pipe,&quot; so CWND is deflated to what it &quot;should&quot; be (&quot;pipe&quot;</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   * / 2).</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   *</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   * So why don&#39;t we do this?  Because we have full selective ACK information.  Therefore we have an</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * explicit pipe variable (m_snd_flying_bytes), which fully accounts for any dropped packets, and</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment">   * we needn&#39;t mess with CWND to compensate for anything.  There is also no ambiguity as to what</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">   * the duplicate ACK means, since we have acknowledgments for each individual packet.  So we</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment">   * basically do what the SACK RFC 3517 recommends.  The only real difference is that while RFC 3517</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment">   * still is written in the context of Fast Recovery being a separate phase (between loss and</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment">   * congestion avoidance) -- which the RFC 3517 algorithm replaces -- which ends once the gaps in</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment">   * the pipe are filled, we use the scoreboard principle (with &quot;pipe&quot;, etc.) for our entire</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">   * operation.  Therefore the phase between loss and congestion avoidance is not special, or even a</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   * different phase, and is just regular congestion avoidance.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   *</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   * This reasoning is validated by DCCP CCID 2 RFC 4341-5, which specifies just this course of</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">   * action. */</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>} <span class="comment">// Congestion_control_classic::on_loss_event()</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a59148ce4dafea4063b6992b9670909dc">  126</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a59148ce4dafea4063b6992b9670909dc">Congestion_control_classic::on_drop_timeout</a>(<span class="keywordtype">size_t</span> bytes, [[maybe_unused]] <span class="keywordtype">size_t</span> packets) <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>{</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>  <span class="keyword">using </span>std::max;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span> </div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>  <span class="comment">/* Node has detected a major loss event in the form of a Drop Timeout.  Follow classic Reno, RFC</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   * 5681: guess that the available pipe (CWND) is half of what we thought it was, but only set</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">   * SSTHRESH to this halved value, and begin slow start at a low CWND, so that it can slow-start</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">   * until reaching this new SSTHRESH and then enter congestion avoidance.  Since CWND is set</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">   * basically to its initial value, the subtleties of on_loss_event() (Fast Recovery and all that)</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">   * don&#39;t apply; we basically just start over almost as if it&#39;s a new connection, except SSTHRESH</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">   * is not infinity. */</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span> </div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>  <span class="comment">// Determine SSTHRESH.</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span> </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>  <span class="keyword">const</span> <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">Peer_socket::Const_ptr</a> sock = <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__strategy.html#a3e9786f9e5f170ca23135a2a815bc3f4">socket</a>();</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span>&amp; snd_flying_bytes = sock-&gt;m_snd_flying_bytes;</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span> </div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>  <span class="comment">/* RFC 5689-3.1 and formula (4).  The halving (or other reduction) of the window is computed in</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * congestion_window_decay().</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   *</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * See also subtlety in on_loss_event() at this point.  It matters even more here, as a Drop</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   * Timeout may well set snd_flying_bytes to zero (and we&#39;re called after registering the Drop in</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   * snd_flying_bytes)! */</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> window_decay_percent = <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a6267f980c8a0f33f8213e1fa4b83ee16">congestion_window_decay</a>();</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> new_slow_start_thresh_bytes = max((snd_flying_bytes + bytes) * window_decay_percent / 100,</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>                                                 2 * sock-&gt;max_block_size());</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span> </div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;cong_ctl [&quot;</span> &lt;&lt; sock &lt;&lt; <span class="stringliteral">&quot;] update: DTO event; set sl_st_thresh &quot;</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>                 <span class="stringliteral">&quot;to [&quot;</span> &lt;&lt; window_decay_percent &lt;&lt; <span class="stringliteral">&quot;%] of &quot;</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>                 <span class="stringliteral">&quot;cong_wnd [&quot;</span> &lt;&lt; sock-&gt;bytes_blocks_str(snd_flying_bytes + bytes) &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>                 <span class="stringliteral">&quot;cong_wnd to minimal value.&quot;</span>);</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span> </div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>  <span class="comment">// Now set SSTHRESH and let m_classic_data set CWND to a low value (common to most congestion control strategies).</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>  <span class="comment">// Will log but not enough (so log the above).</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a03a5671f57a7a8f7b0cdce200d29bd3b">m_classic_data</a>.<a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#a63316b5d9e9a27816b09bb52c464b588">on_drop_timeout</a>(new_slow_start_thresh_bytes);</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>} <span class="comment">// Congestion_control_classic::on_drop_timeout()</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a6267f980c8a0f33f8213e1fa4b83ee16">  164</a></span><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a6267f980c8a0f33f8213e1fa4b83ee16">Congestion_control_classic::congestion_window_decay</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>  <span class="keyword">const</span> <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">Peer_socket::Const_ptr</a> sock = <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__strategy.html#a3e9786f9e5f170ca23135a2a815bc3f4">socket</a>();</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> window_decay_percent = sock-&gt;opt(sock-&gt;m_opts.m_st_cong_ctl_classic_wnd_decay_percent);</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>  assert(window_decay_percent &lt;= 100); <span class="comment">// Should have checked this during option application.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>  <span class="keywordflow">if</span> (window_decay_percent == 0) <span class="comment">// 0 is special value meaning &quot;use RFC 5681 classic value,&quot; which is 1/2 (50%).</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>  {</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>    window_decay_percent = 50;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>  }</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>  <span class="keywordflow">return</span> window_decay_percent;</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>}</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span> </div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a588baa530b660a3437d3a39d68b16404">  176</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a588baa530b660a3437d3a39d68b16404">Congestion_control_classic::on_idle_timeout</a>() <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>{</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>  <span class="comment">/* Node has detected that nothing has been sent out by us for a while.  (Note that this is</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   * different from a Drop Timeout.  A Drop Timeout causes data to be sent (either retransmitted [if</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   * used] or new data), which resets the state back to non-idle for a while.)</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">   *</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">   * This is handled similarly in most congestion control strategies; let m_classic_data handle it</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="comment">   * (will set CWND to initial window and not touch SSTHRESH). */</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a03a5671f57a7a8f7b0cdce200d29bd3b">m_classic_data</a>.<a class="code hl_function" href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#afbe0609319f117e90074e1241abbba5c">on_idle_timeout</a>();</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>} <span class="comment">// Congestion_control_classic::on_idle_timeout()</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span> </div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>} <span class="comment">// namespace flow::net_flow</span></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a></div><div class="ttdoc">Interface that the user should implement, passing the implementing Logger into logging classes (Flow'...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01280">log.hpp:1284</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic__data_html_a63316b5d9e9a27816b09bb52c464b588"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#a63316b5d9e9a27816b09bb52c464b588">flow::net_flow::Congestion_control_classic_data::on_drop_timeout</a></div><div class="ttdeci">void on_drop_timeout(size_t new_slow_start_thresh_bytes)</div><div class="ttdoc">Adjust state, including CWND and SSTHRESH, assuming a Drop Timeout just occurred.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__util_8cpp_source.html#l00293">cong_ctl_util.cpp:293</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic__data_html_a79e85a67e583b74cc414524d53650892"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#a79e85a67e583b74cc414524d53650892">flow::net_flow::Congestion_control_classic_data::on_congestion_event</a></div><div class="ttdeci">void on_congestion_event(size_t new_slow_start_thresh_bytes, size_t new_cong_wnd_bytes)</div><div class="ttdoc">Sets internally stored SSHTRESH and CWND to the given values; appropriately resets internal state so ...</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__util_8cpp_source.html#l00228">cong_ctl_util.cpp:228</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic__data_html_ab3e34468efdf4d9e5b29eceb1fe84665"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#ab3e34468efdf4d9e5b29eceb1fe84665">flow::net_flow::Congestion_control_classic_data::on_acks</a></div><div class="ttdeci">void on_acks(size_t bytes)</div><div class="ttdoc">Adjusts state, including potentially CWND, based on either &quot;congestion avoidance&quot; or &quot;slow start&quot; alg...</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__util_8cpp_source.html#l00076">cong_ctl_util.cpp:76</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic__data_html_adbda0ed3747b1eea62f4d790c37dbe46"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#adbda0ed3747b1eea62f4d790c37dbe46">flow::net_flow::Congestion_control_classic_data::congestion_window_bytes</a></div><div class="ttdeci">size_t congestion_window_bytes() const</div><div class="ttdoc">Return current stored CWND value in bytes.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__util_8cpp_source.html#l00061">cong_ctl_util.cpp:61</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic__data_html_afbe0609319f117e90074e1241abbba5c"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic__data.html#afbe0609319f117e90074e1241abbba5c">flow::net_flow::Congestion_control_classic_data::on_idle_timeout</a></div><div class="ttdeci">void on_idle_timeout()</div><div class="ttdoc">Adjust state, namely CWND, assuming an Idle Timeout just occurred.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__util_8cpp_source.html#l00312">cong_ctl_util.cpp:312</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_a03a5671f57a7a8f7b0cdce200d29bd3b"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a03a5671f57a7a8f7b0cdce200d29bd3b">flow::net_flow::Congestion_control_classic::m_classic_data</a></div><div class="ttdeci">Congestion_control_classic_data m_classic_data</div><div class="ttdoc">The Reno CWND/SSTHRESH-changing engine and CWND/SSTHRESH storage.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8hpp_source.html#l00165">cong_ctl_classic.hpp:165</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_a34b8ef88093f082df7a935bbebfae2f3"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a34b8ef88093f082df7a935bbebfae2f3">flow::net_flow::Congestion_control_classic::on_acks</a></div><div class="ttdeci">void on_acks(size_t bytes, size_t packets) override</div><div class="ttdoc">Implements Congestion_control_strategy::on_acks() API.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00038">cong_ctl_classic.cpp:38</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_a588baa530b660a3437d3a39d68b16404"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a588baa530b660a3437d3a39d68b16404">flow::net_flow::Congestion_control_classic::on_idle_timeout</a></div><div class="ttdeci">void on_idle_timeout() override</div><div class="ttdoc">Implements Congestion_control_strategy::on_idle_timeout() API.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00176">cong_ctl_classic.cpp:176</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_a59148ce4dafea4063b6992b9670909dc"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a59148ce4dafea4063b6992b9670909dc">flow::net_flow::Congestion_control_classic::on_drop_timeout</a></div><div class="ttdeci">void on_drop_timeout(size_t bytes, size_t packets) override</div><div class="ttdoc">Implements Congestion_control_strategy::on_drop_timeout() API.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00126">cong_ctl_classic.cpp:126</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_a6267f980c8a0f33f8213e1fa4b83ee16"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a6267f980c8a0f33f8213e1fa4b83ee16">flow::net_flow::Congestion_control_classic::congestion_window_decay</a></div><div class="ttdeci">unsigned int congestion_window_decay() const</div><div class="ttdoc">Returns the decay (as a percentage) to apply to the congestion window upon encounterling loss.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00164">cong_ctl_classic.cpp:164</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_a98ee7d39ccbacacaec6b9e0deff1e6b1"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#a98ee7d39ccbacacaec6b9e0deff1e6b1">flow::net_flow::Congestion_control_classic::congestion_window_bytes</a></div><div class="ttdeci">size_t congestion_window_bytes() const override</div><div class="ttdoc">Implements Congestion_control_strategy::congestion_window_bytes() API.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00033">cong_ctl_classic.cpp:33</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_aa4fd5c14f20d7534db287c78387d5f0e"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#aa4fd5c14f20d7534db287c78387d5f0e">flow::net_flow::Congestion_control_classic::Congestion_control_classic</a></div><div class="ttdeci">Congestion_control_classic(log::Logger *logger_ptr, Peer_socket::Const_ptr sock)</div><div class="ttdoc">Constructs object by setting up logging and saving a pointer to the containing Peer_socket.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00025">cong_ctl_classic.cpp:25</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__classic_html_af2340e68dbdbb8d6065ae487b05074be"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__classic.html#af2340e68dbdbb8d6065ae487b05074be">flow::net_flow::Congestion_control_classic::on_loss_event</a></div><div class="ttdeci">void on_loss_event(size_t bytes, size_t packets) override</div><div class="ttdoc">Implements Congestion_control_strategy::on_loss_event() API.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl__classic_8cpp_source.html#l00046">cong_ctl_classic.cpp:46</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__strategy_html"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__strategy.html">flow::net_flow::Congestion_control_strategy</a></div><div class="ttdoc">The abstract interface for a per-socket module that determines the socket's congestion control behavi...</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl_8hpp_source.html#l00176">cong_ctl.hpp:180</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Congestion__control__strategy_html_a3e9786f9e5f170ca23135a2a815bc3f4"><div class="ttname"><a href="classflow_1_1net__flow_1_1Congestion__control__strategy.html#a3e9786f9e5f170ca23135a2a815bc3f4">flow::net_flow::Congestion_control_strategy::socket</a></div><div class="ttdeci">Peer_socket::Const_ptr socket() const</div><div class="ttdoc">Utility for subclasses that returns a handle to the containing Peer_socket.</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl_8cpp_source.html#l00063">cong_ctl.cpp:63</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Shared__ptr__alias__holder_html_aef7998db71c60eeb5d1e3d1a97c14886"><div class="ttname"><a href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">flow::util::Shared_ptr_alias_holder&lt; boost::shared_ptr&lt; Peer_socket &gt; &gt;::Const_ptr</a></div><div class="ttdeci">Const_target_ptr Const_ptr</div><div class="ttdoc">Short-hand for ref-counted pointer to immutable values of type Target_type::element_type (a-la T cons...</div><div class="ttdef"><b>Definition:</b> <a href="shared__ptr__alias__holder_8hpp_source.html#l00127">shared_ptr_alias_holder.hpp:127</a></div></div>
<div class="ttc" id="acong__ctl__classic_8hpp_html"><div class="ttname"><a href="cong__ctl__classic_8hpp.html">cong_ctl_classic.hpp</a></div></div>
<div class="ttc" id="alog_8hpp_html_affcf2e4c496ce3f42adf981669c623b8"><div class="ttname"><a href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a></div><div class="ttdeci">#define FLOW_LOG_TRACE(ARG_stream_fragment)</div><div class="ttdoc">Logs a TRACE message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00227">log.hpp:227</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html"><div class="ttname"><a href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div><div class="ttdoc">Flow module containing the API and implementation of the Flow network protocol, a TCP-inspired stream...</div><div class="ttdef"><b>Definition:</b> <a href="asio_2node_8cpp_source.html#l00024">node.cpp:25</a></div></div>
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